This circuit is intended to provide good square waves converting a sine wave picked-up from an existing generator. Its main feature consists in the fact that no power-source is needed: thus it can be simply connected between a sine wave generator and the device under test.
The input sine wave feeds a voltage doubler formed by [...]
Frequency multipliers typically work with square waves. However, the circuit in Figure 1 performs frequency multiplication on triangle waveforms and maintains the input’s amplitude and uniformity.
The general idea is to apply the triangle waveform to any full-wave rectifier. The output is then a triangle wave with twice the input frequency plus some dc bias. You [...]
Three switchable frequencies: 100Hz, 1KHz, 10KHz
1.5V battery operated, minimum parts counting
Read more : Simple Square wave Generator by BC549
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